Celestron has posted motor control firmware updates for the subject mounts at http://www.celestron.com/support/downloads/index.htm You need to download the correct firmware AND the program called " Celestron Programmer". In addition you will need the programming cable. Excellent instructions on installation are available at http://www.nexstarsite.com For those in the Phoenix area I have a programming cable. -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.